For Microsoft.VisualStudio.JavaScript.Sdk projects it should be possible to configure packages installs to use npm ci rather than npm install

### Is your feature request related to a problem? Please describe.
My understanding is for purposes such as building under a CI environment it may be desirable to to use npm ci to install dependencies as it does not write to package-lock.json causing dependencies to be frozen for the project meaning builds can be reproducible.

### Describe the solution you'd like
A property for configuring the command for installing dependencies via npm.